Starrett 57539 A2 Tool Steel Flat Stock 0.75x1.25x18 in

Product Description

The STARRETT 57539 is an A2 air-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need precise, ready-to-use stock for jigs, fixtures, punches, dies, and gauges. Measuring 0.75 inches thick by 1.25 inches wide by 18 inches long, this flat stock is held to tight dimensional tolerances, including a thickness tolerance of plus or minus 0.001 inches and a square tolerance of plus or minus 0.001 inches. A2 tool steel responds well to air-hardening heat treatment, offering good wear resistance and dimensional stability after hardening, making it a dependable choice for precision tooling applications in both shop and production environments.

This flat stock is suited for machine shops, tool-and-die operations, and maintenance departments that fabricate or replace precision components. It ships in the annealed condition, ready for machining before heat treatment. Typical uses include blanks for cutting tools, punches, custom gauges, and wear plates where tight tolerances and consistent material properties are required. The 18-inch length provides enough material to machine multiple shorter components from a single piece.

Key Features

• A2 air-hardening tool steel construction for good wear resistance and dimensional stability after heat treat
• Thickness tolerance of plus or minus 0.001 inches for precise fit in close-tolerance applications
• Square tolerance of plus or minus 0.001 inches ensures consistent cross-section geometry
• Width tolerance of plus 0.000 to minus 0.005 inches for predictable stock removal during machining
• Length tolerance of plus 0.250 inches allows sufficient facing stock on each end
• Single-piece minimum order quantity for low-volume and prototype work

Compatibility

Designed as a standard A2 tool steel flat stock blank suitable for general toolmaking, die making, and precision machining applications where AISI A2 air-hardening tool steel material is specified.

Installation Notes

Machining and heat treatment of tool steel flat stock should be performed by qualified machinists or toolmakers familiar with A2 steel. Always follow appropriate shop safety practices when cutting, grinding, or heat treating tool steel. Heat treatment, including hardening and tempering, should follow the material manufacturer's published guidelines for AISI A2 tool steel. Personal protective equipment including safety glasses and heat-resistant gloves is required during any thermal processing operations.